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Thread: High CYA and yellow algae

  1. Back To Top    #1

    Join Date
    Jul 2014

    High CYA and yellow algae

    Hi Everyone,

    When we purchased our pool, it came with a "Simple Salt" system, which requires some weekly additives. The initial fill was water from our town's fire department. We got it in late July of last year and closed it down in September. Last year was great, and so was this year for the most part. Recently though I've noticed some yellow algae building around the steps. After multi shocks, and sweepings, the algae is still there. Previously only testing for FC and PH, I decided (after reading this forum) to buy a test kit that tests more. Here is our latest test:

    ALK: 200
    PH: 8.4
    HRD: 200
    CYA: 200
    FC: .5

    Obviously CYA is through the roof, and PH is very high. I've read that my best option may be to partially drain the pool to get the CYA down. We're almost to September, and weather is in the low 80's. Do I drain and refill now, so I can balance out before winter? Or will winter kill the algae and I can worry about draining and refilling in the spring?

    Any opinions are greatly appreciated!!!



  2. Back To Top    #2
    Mod Squad tim5055's Avatar
    Join Date
    May 2014
    Columbia, SC

    Re: High CYA and yellow algae

    Use muratic acid to get the pH in line now, that can't wait.

    It's up to you if you can live with algae in the water no to deal with it in the spring. Are you planning on sticking with your system or are you going to change methods?
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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